# This defines the 1 by 4 topology 
# has variables Points  pWN (), pEN ()
#                       pWS (), pES (),
#               Curves   cW (),  cE (),
#                        cS (),  cN ()  
10 
 0    0.0 0.0 0.0   node_point    { [pWS]_pnt } 
 1    0.0 0.0 0.0   node_point    { [pES]_pnt } 
 2    0.0 0.0 0.0   node_curve    { [cW]_crv } 
 3    0.0 0.0 0.0   node_curve    { [cE]_crv } 
 4    0.0 0.0 0.0   node_curve    { [cW]_crv } 
 5    0.0 0.0 0.0   node_curve    { [cE]_crv } 
 6    0.0 0.0 0.0   node_curve    { [cW]_crv } 
 7    0.0 0.0 0.0   node_curve    { [cE]_crv } 
 8    0.0 0.0 0.0   node_point    { [pWN]_pnt } 
 9    0.0 0.0 0.0   node_point    { [pEN]_pnt } 
13 
 0       0       1   edge_curve   { [cS]_crv}
 1       2       3
 2       4       5
 3       6       7
 4       8       9   edge_curve   { [cN]_crv } 
 5       0       2   edge_curve   { [cW]_crv } 
 6       1       3   edge_curve   { [cE]_crv } 
 7       2       4   edge_curve   { [cW]_crv } 
 8       3       5   edge_curve   { [cE]_crv } 
 9       4       6   edge_curve   { [cW]_crv } 
10       5       7   edge_curve   { [cE]_crv } 
11       6       8   edge_curve   { [cW]_crv } 
12       7       9   edge_curve   { [cE]_crv } 
 4 
 0       4       0       6       1        5 
 0       4       1       8       2        7 
 0       4       2      10       3        9 
 0       4       3      12       4       11
